object drop in canvas on button click event

Question

i create grid in xaml

 

<Grid >

<Grid.RowDefinitions>

<RowDefinition Height="Auto"/>

<RowDefinition/>

</Grid.RowDefinitions>

<ScrollViewer x:Name="scrollviewer1"

Visibility="Visible" Grid.Row="1" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto" PreviewMouseDown="scrollviewer1_PreviewMouseDown">

<Grid x:Name="MainStK" AllowDrop="True" >

</Grid>

</ScrollViewer>

</Grid>

 

code behind xaml is

 

Button CreateButton(string rungId)

{

Button button = new Button() { VerticalAlignment = VerticalAlignment.Stretch, HorizontalAlignment = HorizontalAlignment.Stretch, Content = rungId, Tag = rungId };

button.Click += Button_Click;

return button;

}

Border CreateDesignerCanvas(string rungName)

{

Border border = new Border();

border.BorderBrush = Brushes.Black;

border.BorderThickness = new Thickness(.5);

DesignerCanvas designerCanvas = new DesignerCanvas()

{

Focusable = true,

ContextMenu = (ContextMenu)FindResource("DesignerCanvasContextMenu"),

Background = Brushes.LightYellow,

Name = rungName,

//Margin = new Thickness(3)

};

border.Child = designerCanvas;

return border;

}

void CreateGridSplitter(int rowId)

{

GridSplitter splitter = new GridSplitter()

{

VerticalAlignment = VerticalAlignment.Bottom,

HorizontalAlignment = HorizontalAlignment.Stretch,

//ResizeBehavior = GridResizeBehavior.PreviousAndNext,

Background = new SolidColorBrush(Colors.Green),

Height = 5

};

MainStK.Children.Add(splitter);

Grid.SetRow(splitter, rowId);

Grid.SetColumnSpan(splitter, 2);

}

public Window1()

{

InitializeComponent();

MainStK.RowDefinitions.Add(new RowDefinition());

MainStK.RowDefinitions.Add(new RowDefinition());

MainStK.ColumnDefinitions.Add(new ColumnDefinition() { Width = GridLength.Auto });

MainStK.ColumnDefinitions.Add(new ColumnDefinition());

string rungName = string.Empty, rungName2 = string.Empty;

rungName = "Rung1";

rungName2 = "Rung2";

Border designerCanvas = CreateDesignerCanvas(rungName);

Border designerCanvas2 = CreateDesignerCanvas(rungName2);

Button button = CreateButton("1");

Button button2 = CreateButton("2");

Grid.SetRow(designerCanvas, 0);

Grid.SetRow(designerCanvas2, 1);

Grid.SetColumn(designerCanvas, 1);

Grid.SetColumn(designerCanvas2, 1);

Grid.SetColumn(button, 0);

Grid.SetColumn(button2, 0);

Grid.SetRow(button, 0);

Grid.SetRow(button2, 1);

MainStK.Children.Add(designerCanvas);

MainStK.Children.Add(designerCanvas2);

MainStK.Children.Add(button);

MainStK.Children.Add(button2);

//CreateGridSplitter(0);

//CreateGridSplitter(1);

}

 

now i want to place rectangle on grid using button click event what should i do